It can damage your teeth.

Although a squeeze of lemon in your water every day may seem harmless, it can wreak some major havoc on your pearly whites.

Since lemons are highly acidic, frequent exposure can erode your tooth enamel, the American Dental Association warns. If you're not sure what eroded enamel would look like, imagine your teeth with a yellow tint and a coarse feeling when you touch them to the tongue.

If that doesn't convince you to skip the lemon wedge, at least try to drink it out of a straw to cut down on the acid exposure on your teeth.

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It can upset your stomach.

Lemon water can cause stomach pain.
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Too much of anything is a bad thing, even when it comes to lemon water.

Lemon skins serve as a host for unpleasant organisms.

If you're a germaphobe, you may want to steer clear of putting lemon wedges in your water — at least in a restaurant.

In a 2007 study in the Journal of Environmental Health, researchers tested the rinds and flesh of lemons from more than 21 restaurants. In conclusion, they found that nearly 70% of the lemons contained organisms such as E. Coli, which can cause vomiting and diarrhea.

Using concentrated lemon juice can cause cavities.

Growing up, you were probably instructed not to eat too much candy or you would get cavities. Well, it turns out candy isn't the only culprit of tooth decay.

According to Healthline, cavities are a result of damaging bacteria that digest the sugar in foods and produce acids. Although lemon water on its own may not lead to the development of cavities, if you typically sweeten it with sugar or use concentrated lemon juices instead of a freshly squeezed lemon, then you could have a problem on your hands… and teeth.

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You may worsen canker sores.

Lemon water will exacerbate canker sores.
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Nothing is worse than waking up to the painful irritation of a newly formed canker sore in your mouth.

While most canker sores will clear up on their own within a week or two, coping with the uncomfortable annoyance for even that long can feel like forever.

If you drink lemon water while dealing with a mouth sore, you're probably making it worse without realizing it. Lemon water can do more damage to your mouth than just decay your tooth enamel, it also has the potential to exacerbate canker sores and irritate mouth sores, according to the American Dental Association.

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Citrus fruits may trigger migraines.

It's still up for debate.
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If you deal with headaches or migraines of any nature, it's safe to say you don't want to take any chances by eating or drinking something that could trigger them. And citrus fruits, including lemons, are among that category.